This question seems to get asked every few months.
Where are you going to find an electric clutch capable of transmitting the torque needed to provide boost? All the electrics clutches I have researched have torque ratings in inch pounds, nowhere near strong enough to generate any kind of boost never mind get a shaft spinning up at 5000 rpm?
The only ones capable have their diameter measured in feet and are not designed to slip for any length of time. You would be far better off using air or oil actuated clutches, but they are still designed to be either off or on, slippage will destroy them very quickly unless you cool them. Your description sure sounds like a perfect fit for a turbocharger, what is wrong with nearly free boost? A blower is a parasitic loss? If it was possilbe with todays electric clutch technology it would have been done already.
Remember Mad Max was just a movie.